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Microglia, the brain's intrinsic immune cells, rapidly sense brain injury and help clear cellular debris. Haynes et al. now show that P2Y12 receptors are critical for activating microglia and directing them to the site of injury.
Sensory systems are thought to use an internal copy of motor commands to determine which sensations are caused by the self versus the world. A new paper proves that an identified pathway performs this function for eye movements.
Multiple local motions must be combined to determine the direction of object motion, which is harder than it seems. A new paper proposes an elegant and simple solution to this problem, eminently realizable in feed-forward circuits.